June 19, 2013
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Article Photos: Chile's huge open-pit copper mine goes underground
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In this Sept. 25, 2012 photo, a worker from the National Copper Mine Corporation, or Codelco, looks at the area where a new tunnel is marked to be drilled at the Chuquicamata copper mine in the Atacama desert in northern Chile. Experts say that by 2019 the Chuquicamata copper mine will be unprofitable, so state-owned mining company Codelco is trying to head off closure by converting the open pit into the world's largest underground mine. Codelco believes the mine still has much more to give, with reserves equal to about 60 percent of all the copper exploited in the mine's history still buried deep beneath the crater. (AP Photo/Jorge Saenz)
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